ci: Bump image version in the Harvester repo when tagging

Add a workflow to create a PR in the harvester/harvester repo when seeing a tag event.
The workflow will:
- Determine the stable branch in this repo. e.g., version v0.7.8 -> branch v0.7.x.
- Reading the file `.github/branch-mappings.yaml` and determine the corresponding
  Harvester branch. e.g., v0.7.x -> v1.4
- Clone harvester/harvester repo and modify the component's image tags in
  `deploy/charts/harvester/values.yaml`
- Submit a PR.

Don't log error if we gonna return it

Signed-off-by: Weihang Lo <[email protected]>

Let SaveBlockDevice update more precisely

A new block device status is derived from sysfs, and that results
in lacking `FileSystem.LastFormattedAt`. We copy that field before
`DeepEqual` comparison to reduce unnecessary updates.

Signed-off-by: Weihang Lo <[email protected]>

Remove leader since NDM should run on every nodes

NDM as a daemonset should run on every nodes to detect disk attachments
and detachments. Therefore the leader election is unnecessary for NDM.

Signed-off-by: Weihang Lo <[email protected]>